CVE-2026-77234 PUBLISHED

Improper input validation in FreeRTOS-Kernel timer command handling

Assigner: AMZN
Reserved: 20.08.2026 Published: 21.08.2026 Updated: 21.08.2026

Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Local	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	FreeRTOS
Product	FreeRTOS-Kernel
Versions	Default: unaffected affected from 7.0.0 to 11.3.0 (incl.)

Credits

NVIDIA finder

References

Problem Types

CWE-863: Incorrect Authorization CWE

Impacts

CAPEC-233 (Privilege Escalation)